瑜伽論記 12.44

12.44

得彼法體者，舊地持云：得自在。經云：得長家已得勢力自在，又得體法得如來之體，謂真如是體法，又十自在言體法。

Regarding 'attaining that Dharma-essence': the old Dichilun states: 'He attains mastery.' The sūtra states: 'Having grown in the family, he attains sovereign power and mastery; he also attains the Dharma-essence, attaining the essence of the Tathāgata'—meaning that tathatā is the Dharma-essence; alternatively, the ten masteries are referred to as the Dharma-essence.